photograph: Ice Age cliffs, Sheldon Point, Irving Nature Park, Saint John, New Brunswick, 1990. New Brunswick Museum. Irving Nature Park, Saint John. Red clay cliffs at Sheldon Point record events at the end of the last ice age. The clay was once the sea bottom, deposited at a time when sea level was higher than it is today. The clay contains fossils of clams, snails, brittlestars, sea urchins and barnacles. Radiocarbon dating of the shells shows the age of these sediments date from 13,000 to 11,000 years old.